Excuse me:
When our tests the RX selectivity of nrf52832, the test results are inconsistent with those in the datasheet(nRF52832 Product Specification v1.4 P232). How did it happen? Do you have any reference documents?
selectivity can be measured with two generators.
signal generator A that provides the wanted signal( level at Pout= -64 dBm@2402MHz,2Msps mode, nrf52832 1#）.
signal generator B (CMW270) with an unmodulated signal is used as the interferer and combined with the primary signal using a power combiner. signal generator B is placed at the desired frequency offset and then the power is increased until the BER degrades to 0.1%(nrf52832 2#).
Our test results are as follows:
| frequency offset（MHz） | Interferer signal level（dBm） | TEST C/I2M（dBc) | DATASHEET C/I2M（dBc) |
| -32*(2370) | -26.21 | -40.84 | -52 |
| -6 | -24.69 | -42.36 | -42 |
| -4 | -42.61 | -24.44 | -20 |
| -2 | -43.62 | -23.43 | 6 |
| 0 | -74.44 | 7.39 | 10 |
| 2 | -32.21 | -34.84 | -14 |
| 4 | -24.69 | -42.36 | -44 |
| 6 | -22.67 | -44.38 | -47 |
| 28(2430) | -26.69 | -40.36 | -52 |
